What is the best gas grade for 1991 dodge dynasty?

Asked by Yukon_2183 Mar 05, 2017 at 10:17 AM about the 1991 Dodge Dynasty 4 Dr LE Sedan

Question type: General

What is the best gas grade for 1991 dodge dynasty?

158,935

Bob answered 7 years ago

Agree with TOM.

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Yukon_2183 answered 7 years ago

Mechanic recommended Sunoco 89 grade. My mpg is at 7.5

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158,935

Bob answered 7 years ago

89 Octane won't hurt it, but if you are only getting 7.5 mpg it may need a repair or tune up. 89 Octane will likely not help the fuel mileage.

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Yukon_2183 answered 7 years ago

I had a recent tune up. New spark plugs pcv valve air filter oil change with very little improvement. Yesterday I purchased Sea Foam motor treatment and the salesman said mpg should improve at about half a tank. I hope so. The car runs very well but I'm having transmission problems Thank you

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F_O_R answered 7 years ago

At 7 1/2 mpg I would use the cheapest gas I could find.

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Bob answered 7 years ago

Sea Foam won't do squat. Just saying....

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